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Push Button (Normally Open)
This switch is in ON state when the button is pressed otherwise it is in OFF state.
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Push Button (Normally Closed)
This switch is initially in ON state. This goes to OFF state when it is released.
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Spst Switch
Single pole single throw is abbreviated as SPST. This acts as ON/OFF switch. Poles define the number of circuits it can be connected to and throws defines the number of positions that a pole connects.
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Spdt Switch
Single pole double throw is abbreviated as SPDT. This switch allows the current to flow in any one of the two directions by adjusting its position.
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Dpst Switch
Double pole single throw is abbreviated as DPST. This switch can drive two circuits at a time.
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Dpdt Switch
Double pole double throw is the full form of DPDT. This can connect the four circuits by changing the position.
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Relay Switch
This represents the relay switch. This can control the AC Loads using the DC voltage applied to the coil.
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